if you have an 02+ then its a cali spec automatically.
if you have a 99-01. well. if you have the heat shield removed or you can see behind the heat shield that would be a plus. if your manifold looks like a pile of mashed potatoes then its a cali spec. if it looks similar to aftermarket headers then its a fed spec.
if you have more than one cat converter then its a cali spec
if you have a wire (o2 sensor) going into the exhaust manifold its a cali spec
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